Huh, I also used to have a cat who’d go nutty for green olives. I had no idea it was so common. The weird thing was, we had to stop giving him catnip because he’d get downright mean when he was on it. His eyes would get real big and his fur would all fluff up and he’d scratch the shit out of anyone who came near him. But green olives just made him act goofy (the way most cats react to catnip).